Shoe roughing tool



NOV. 6, 1934. GODDU 1,979,381

SHOE ROUGHING TOOL Filed Jan. 24, 1930 llllllllll Patented Nov. 6, 1934 umrs STATES PATENT OFFHQE SHOE ROUGHING TOOL Application January 24,

1930, Serial No. 423,204.

In Great Britain. J anuary 8, .1930

16 Claims.

iThisinvention relates to roughing tools and is particularly applicable totools for roughing shoe parts, to provide effective surfaces for the reception of cement intended to unite said parts.

In the manufacture of shoes in which parts are united by cement it is important that the surface finish, if any, of the material, for example leather, of which the shoe parts are made be removed throughout the areas to be cemented and the material be roughened sufficiently to ensure that the cement shall adhere mosteffectively to it. A common example of this kind of work is the roughing of thesurface of the overlasted margin of the upperof a lasted shoe to which an outer sole is to be attached by cement.

It is an object of the present invention to provide an improved tool for performing the operation of roughing shoe parts rapidly and uniformly without danger to the material being operated upon.

-With this object in View, the invention comprises aroughing tool having a plurality of rigid, yieldingly mounted, sharp abrading elements. "The said elements may, for example, consist of stiff, rigid blades of steel or other hard metal and may be provided with toothed or otherwise roughened portions suited for abrading the surface of a piece of leather or the like without cutting through the body of the piece. Such rigid abrading elements will not become bent or misshapen, as do the bristles of the wire brushes often used for the work under consideration; the form of thetool will, therefore, be preserved and the rapid production of accurate, uniform work will accordingly be facilitated. 1n the illustrated device the abrading blades are loosely mounted upon a rotary carrier in such a manner that centrifugal force may cause them to be thrown yieldingly outward as the carrier rotates, whereby they may easily conform to, and follow, the shape of the surface operated upon.

In this connection, a feature of the invention consists in the provision of a limiting stop for the abrading blades constructed and arranged to prevent outward movement of said blades beyond positions in which their abrading portions, taken collectively, have a curved outline, transversely of the tool. The significance of this is that when the tool is running freely its working outline is curved sufficiently to permit it to 'accommodateitself to the curves on the bottom of a lasted shoe without requiring some of the "blades to yield a great deal more than others; the result being that the production of a uniform surface upon the work is made comparatively easy anddanger of damage is minimized.

As shown, one convenient form of limiting stop consists of a pinwhich passes through slots in a plurality of blades stacked side by side, the surface of said pin being concavely curved, longitudinallyof the pin, so that the outer, abrading portions of the blades when thrown outward by centrifugal force assumes, collectively, a convex curvature.

. One or more stacks .or groups of abrading blades may be provided and, in a convenient arrangement, a plurality of such groups maybe arranged around the periphery of a rotary carrier, being spaced equidistantly from its axis.

Preferably the blades are loosely pivoted upon the carrier and are so arranged that if the work is pressed against them sufiiciently hard to overcome the effect of centrifugal force they will be forced into engagement with a yielding cushion backing member, which may consist of rubber or equivalent material, whereby the abrading action upon the work may be increased to any desired extent and yet kept uniform and smooth.

These and other features of the invention, and benefits to be derived from its use, will be better understood and appreciated from reading the following detailed description of one good, practical embodiment thereof, in connection with the accompanying drawing in which:

Fig. 1 is a view in elevation of the tool with cover plate removed; and

Fig. 2 is a sectional view, II--II of Fig. 1.

the

taken upon the line In the drawing, the tool is illustrated as operating to produce a roughened, or abraded surface upon the overlasted portion 12 of the upper of a shoe'l l mounted upon a last 16. The usual inner sole over which the margins of the upper are lasted is shown at 18 and the illustrated operation is for the purpose of preparing the shoe bottom for the reception of cement by which an .outer sole is to be attached to the shoe.

The roughing tool is mounted upon the reduced end portion 20 of a shaft 22 which may be rotated at a suitable speed by any desired means, the tool being secured in position upon the shaft by a washer 24 and a nut 26 threaded upon the end of the shaft.

The tool itself comprises a disk 28 having a, hub 30 bored to fit snugly upon the reduced end portion 20 of the shaft 22, and a second disk or cover plate 32 which is fitted to the hub 30 and secured thereto by screws 34.

Groups of stifi, rigid abrading blades 36, of steel or other hard metal, are arranged side by side in stacks and hung loosely upon pivot pins 38 mounted in the disk 28. Each of the blades 36 is Slotted, as shown at 40, and through the slots of all the blades of each group passes a stop pin 42. The stop pins 42 are headed, as shown at 44, and are also mounted in the disk 28, being held therein by a retaining plate 46 secured to the hub portion of the disk by screws 48. The cover disk or plate 32 is provided with holes to receive the ends of .the pins 38, 42 and is maintained in proper register by a dowel pin 50, also secured in the hub 30.

The operative abradingportions of the blade36 are provided with sharp teeth '50 designed .to abrade the surface of the work smoothly-and .uni formly. The pins 42 serve as limiting stops to prevent excessive outward movement of the blades under the influence of centrifugal force-as the tool rotates. As shown, the surface ;of each pin 42 is concavely curved, longitudinally of the pin, as illustrated :at :52, so that the toothed abrading portions 59 0f thelblades, when thrown outward by centrifugal force, assume collectively -a convex curvature transversely of the tool, as illustrated at 54.

It will be seen that the disks 28, '32 constitute a rotary carrier upon which the abrading blades are loosely pivoted to permit :them to be thrown outward by centrifugal force as the carrier rotates and that the pins 42 constitute stop .means for limiting the outward throw of the blades relative to the carrier.

The rear portion :of each blade 36 is provided with a projection :56 arranged to'engage anannular yielding backing member or cushion 58, .as shown at 60 (Fig. 1) if the work is pressed forcibly against the toothed portions of the blades. The backing member 58 may conveniently consist of a ring of rubber surrounding the hub 30 and secured in position by the disks 28, .32.

In operation, the tool is kept in rapid rotation and the bladesare thrown outward by centrifugal force 'to positions determined by the stop pins 42. When the work is presented to the tool -it may be pressed lightly against the teeth 50, in which case only avery thin layerof material will be removed, the blades yielding individually so that they collectively conform to the shape of the surface being operated upon and treat it evenly and uniformly. By reason of the normally 'convexcurvature of the collective abrading portions of the blades, as shown at 54, the tool is able to follow such curves as are found in the bottom of .a shoe with a minimum of difference in the extent to which the individual blades are required to yield,

with a consequent advantage in respect to the ease and certainty with which a uniform surface is produced upon the work. If a more vigorous abrading action is required the shoe may be pressed more forcibly against the tool, the abrading blades engaging the yielding backing member 58 which will permit them, while operating more forcibly, still to conform to the shape of the surface being roughened.

The improved roughing tool of the present in- 'vention has a very smooth, soft, easily controlled action upon the work, .as contrasted with the relatively rough, harsh, uneven action of tools heretoforeuscd for this operation, thus reducing very materially, the degree of care and skill required to be exercised by the operator to avoid imperfect results .or tearing and damage of the work. This is particularly advantageous when the operation is being performed upon the uppers shoes, which are frequently made of leather that is delicate or tender and easily damaged.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A roughing tool for shoe parts, comprising a plurality of rigid, yieldingly mounted, sharp abrading blades, and means for preventing said blades from rolling upon the work.

.2. A roughing tool for shoe parts, comprising a plurality of rigid, yieldingly mounted, sharp toothed abrading blades, and means for prevent .ingsaidblades from rolling upon the work.

3. Aroughing tool for shoe parts, comprising a rotarycarricr and plurality of sharp abrading blades pivotally mounted upon said carrier.

4. Arroughing tool for shoe parts, comprising a rotary carrier, a plurality of blades pivotally mounted upon the carrier and having toothed edges for abrading the Work, and means for preventing said blades from rolling upon the 'work.

5. Airoughing tool for-shoe parts, comprising a rotary carrier, a plurality of .blades loosely pivoted upon the carrier andhavingrtoothed edgeszadapted to .have an abrading action upon the work, and means for preventing said blades from :rolling upon the work.

6. A roughing tool for shoe parts, comprising .a rotary carrier and a plurality of sharp sabra'ding blades loosely mountedupon the carrier to .permit E05 said blades to be thrown outward =by centrifugal force as the carrier rotates.

7. A roughing'tool for shoe parts, comprising a rotary-carrier, a plurality of sharp abrading blades loosely mounted upon the carrier to permit said 2 2 blades to be thrown outward by centrifugal force as the carrier rotates, and stop means forlimiting the outward throw :of the :blades relative to the carrier.

8. A roughing tool for shoe parts, comprising a". rotary carrier, a-plurality of toothed blades loosely pivoted upon the carrier to permit them to be thrown outward by centrifugal force, and stop means for limiting the outward throw of the blades relative to the carrier. "1

-9. A roughing tool for shoeparts, comprising a rotary carrier,a plurality of slotted, sharp, abrading blades loosely mounted upon the carrier to permit them to be thrown outward 'bycentrifugal force, and -a stop pin passing through the .slots mi said blades to limit their outward throw relative to the carrier.

.10. A-roughing tool for shoe parts comprislng a rotary carrier, a plurality of slotted abrading blades loosely mounted upon the carrier to permit them to be thrown outward by centrifugal force, and a. pin having a longitudinallycurved stop surface passing through the slots in said blades.

11. A roughing tool for shoe parts, comprising a rotary carrier, a plurality of abrading blades 1 loosely mounted upon the carrier, and a pin having a stop surface concavely curved, longitudinally of the pin, positioned to be engaged by the blades when they are thrown outward by centrifugal force to cause their abrading portions to assume" collectively a convex curvature.

12. A roughing tool for shoe parts, comprising a rotary carrier, a plurality of sharp abrading blades loosely mounted upon the carrier, and a yielding backing member arranged to be engaged by said blades.

13. A roughing tool for shoe parts, comprising a rotary carrier, a plurality of sharp abrading blades loosely pivoted upon said carrier to permit them to be thrown outward by centrifugal force,

and a yielding backing member arranged to be engaged by said blades when they are pressed inward by the work.

14. A roughing tool for shoe parts, comprising a pair of disks, a plurality of toothed, slotted, abrading blades loosely pivoted between said disks, limiting stop pins mounted in the disks and passing through the slots in the blades, and an annular, yielding backing member secured between the disks and arranged to be engaged by the blades.

15. A roughing tool for shoe parts, comprising a rotary carrier, and a plurality of sharp groups of abrading blades loosely mounted upon the carrier to permit them to be thrown outward by centrifugal force as the carrier rotates, each of said sEW is V r is r 5% CERTIFICATE GE EORRECTION.

Patent No. 1,979, 381. November 6. i934.

GEQRGE GODDU.

if is hereby eeriified iiiat error appears in the printed specification of the above numbered patent requiring esrrection as inflows: Page 3, iine 12 claim 15, strike eui tire word "sharp" and insert the same before "abrsding" in line 13, of said claim; and that the said Letters Paieiit sheuid be read with this correction therein that the same may cenierm is the record ei tire ease in tile Patent ()ifiee.

Signed and seaied this 9th day of April, A. D. 1935.

Les i is Frazer (Sea!) Acting Commissioner 0f Patents. 

